<?php
/**
 * Programmatic model for an SQL Expression (columns, functions, aliases)
 */
class SQLExpression {
	private $value;
	
	/**
	 * Sets a value as expression.
	 * 
	 * @param string $value
	 */
	public function __construct($value) {
		$this->value = $value;
	}
	
	/**
	 * Converts expression to string
	 */
	public function toString() {
		return $this->value;
	}
}